It was nearly eight o’clock on Thursday evening. On sunny summer nights, there would be more than an hour of light left, but the clouds overhead were thick and gray, making the dusk look like night. A steady breeze blew dust off the dirt roads. Hot, humid air came with it. Stride walked up the sidewalk, where green grass pushed between the squares of pavement. He noticed a driveway leading to a detached garage behind the house and saw a 1980s-era tan Impala parked in the weeds.

The wooden steps to the porch sagged under his feet. He went up to the front door and peered inside, seeing lights downstairs. When he rapped his knuckles on the door frame, he saw a tall, stocky woman emerge from the kitchen with an apron tied around her waist. She answered the door, and Stride saw an older version of the woman who had taught him math during his junior year in high school.

“Can I help you?” she asked, drying her hands on the flowers of the apron. Under the apron, she wore a collared white knit shirt and shorts. The windows were closed, and the air from the house was stale and warm.

“Ms. Mathisen?”

“Yes.”

“My name is Lieutenant Jonathan Stride. I’m with the Duluth police. You wouldn’t remember me, but you were my math teacher for a year back in high school. That was longer ago than either of us would like to admit, I think.”

Rikke didn’t smile. “Police?”

“Yes, I was hoping to talk to Finn.”

“He’s not here.”

“Do you know when he’ll be back?”

“No.”

“Well, do you mind if I come in? I’d like to ask you a few questions, too.”

Rikke didn’t rush to invite him inside. “You said you’re with the Duluth police? Shouldn’t you have someone from Superior with you? This isn’t Minnesota, you know.”

“I know, but that’s not actually necessary,” Stride told her. “This won’t take long.”

Rikke shrugged and opened the door. Inside, the old house was decorated with worn throw rugs woven in diamond patterns and half a dozen clay pots of drooping philodendron plants. He noticed two skinny cats wandering across the wooden floors. A fine layer of cat hair had settled over the living room furniture, and he caught a whiff of ammonia. He sat down in an uncomfortable Shaker chair. Rikke untied her apron and sat on the sofa opposite him. She picked at the fraying fabric and pulled white foam from the arm of the sofa. An orange tabby walked across her lap.

“What do you want?” she asked.

He tried to picture the twenty-something teacher inside her. Back then, she had been tall and fit, with wavy, flowing blond hair and Nordic good looks. She had intense blue eyes and large circular glasses propped on her high cheekbones. Full, ripe breasts swelled underneath her white sweaters and defied gravity. Her fleshy, strong thighs bulged out of her jeans. She had a severe way about her in the classroom, like a dominatrix. They joked about it in the locker room. “Teacher, I’ve been bad.”